/**app.wxss**/
.navigation {
  background-color: aliceblue;
}
 
.bg_filter {
  position: absolute;
  z-index: 0;
  left: 0;
  top: 0;
  width: 100vw;
  height: 100vh;
  /* background: rgba(255, 255, 255, 0.25);box-shadow: inset 0px 0px 4px rgba(0, 0, 0, 0.25);
   */
  backdrop-filter: blur(40px);
}

//弹性盒
.flexbox(){ 
  display: flex;
  justify-content: center;
  align-items: center;
}

//元素居中
.alignCenter(){
  position: absolute; 
  top: 50%; 
  left: 50%; 
  transform: translate(-50%, -50%); 
}